698541ceb7
copyfd() duplicates file descriptors - it used to be widely used, but these days has seen its popularity dwindle. Strip it of an option that ceased to be variable (simplifying code) and cause all its users to check its result, so it does not need to handle errors itself (simplifying code further), and make it become a private inernal routine in redir.c (all callers from other places have switched to a more modern interface.) Make sure we error() if N>&N fails (if N is closed.)
50 lines
2.2 KiB
C
50 lines
2.2 KiB
C
/* $NetBSD: redir.h,v 1.21 2016/05/12 13:31:37 kre Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)redir.h 8.2 (Berkeley) 5/4/95
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*/
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/* flags passed to redirect */
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#define REDIR_PUSH 0x01 /* save previous values of file descriptors */
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#define REDIR_BACKQ 0x02 /* save the command output in memory */
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#define REDIR_VFORK 0x04 /* running under vfork(2), be careful */
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#define REDIR_KEEP 0x08 /* don't close-on-exec */
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union node;
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void redirect(union node *, int);
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void popredir(void);
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int fd0_redirected_p(void);
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void clearredir(int);
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int movefd(int, int);
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int to_upper_fd(int);
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